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Chemical Engineering Thermodynamics

Q1:

Pick out the wrong statement.

A Cp of monoatomic gases such as metallic vapor is about 5 kcal/kg.atom.

B The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state.

C There is an increase in entropy, when a spontaneous change occurs in an isolated system.

D At absolute zero temperature, the heat capacity for many pure crystalline substances is zero.

ANS:B - The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state.

The wrong statement is: "The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state." In reality, the heat capacity of a substance typically differs between its solid and molten states due to differences in molecular arrangement, intermolecular forces, and degrees of freedom. So, the heat capacity usually changes with the state of matter. Therefore, this statement is incorrect.



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